<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>3-1</title>
	<style type="text/css">
		.body{
			background: #DC4437;
		}

		.main {
			width: 500px;
			height: 500px;
			margin: auto;
			border-radius: 25px;
			border: #2196F3 1px solid;
			background: #2196F3;
			text-align: center;
			position: absolute;
			top: 0;
			left: 0;
			right: 0;
			bottom: 0;
		}
	</style>
</head>
<body class="body">
	<div class="main">
		<h1 style="font-size: 80px;color: white;font-family: Arial;">404</h1>
		<h3 style="font-size: 60px;color: black;font-family: '黑体';">NOT FOUND</h3>
	</div>
</body>
</html>